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Thank you, Kendall Jenner, for giving us our first "moment" of the Billboard Music Awards.

While performers like Shakira, One Republic and Florida Georgia Line all came and went with perfectly adequate performances ... and Iggy Azalea and Ariana Grande slayed "Problem" ... it was the 18-year-old reality TV star who had the first incident everyone will be talking about tomorrow.

Our next moment didn't happen on stage, but behind the scenes after one of the show's earlier performances.

After doing a slinky rendition of her hit "Empire," Shakira was met backstage by her hot soccer star baby daddy Gerard Pique -- and she was VERY happy to see him.

Just look at that greeting he received! Get it, Shaki!

On deck: Robin Thicke.

The singer picked up the trophy Top R&B Song for "Blurred Lines," and took time to thank his estranged wife Paula Patton.

"I'd like to thank my wife for her love and support and for putting up w/ me all these years," he said before exiting the stage.

He later performed a song called "Get Her Back," which was obviously about Patton with lyrics like "I should have kissed you longer, I should have held you stronger and I'll wait for forever for you to love me again."

Other notable moments:

- Justin Timberlake picked up Top Artist and thanked "Everyone on Earth, everybody on Earth, except Donald Sterling" during his acceptance speech.

- Miley Cyrus performed "Lucy In the Sky with Diamonds" with The Flaming Lips star Wayne Cone.

Click through the gallery below to see more hot looks from the red carpet!